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[tor-talk] Persistent XSS vulnerability in TorStatus
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"TorStatus is a website display used to summarize metrics about the Tor
Network. It's a precursor to http://metrics.torproject.org. The code
repository is at
https://svn.torproject.org/svn/torstatus/. Example running sites are
http://torstatus.blutmagie.de/ [...]"
Note: TorStatus is not a Tor Project product and is not maintained.
Vulnerability
- -------------
DisplayRouterRow() in index.php prints the contact information string
from a server descriptor - defined via 'ContactInfo' in torrc by a node
operator - into the HTML page without proper output encoding. This leads
to a persistent cross-site scripting vulnerability where every Tor node
operator can insert HTML/JavaScript on all vulnerable TorStatus mirrors.
The contact information column is only included in the HTML page if the
end-user (browsing a TorStatus mirror) adds the contact column
via "Advanced Display Options" (column_set.php), the contact column is
not included by default. An attacker might set the displayed columns for
a victim via CSRF.
A simple search in the server descriptors of the last two months did not
reveal an obvious exploitation in that time period. The simple search
used is not suitable to give a clear answer.
[grep -hir ^contact * |egrep -i '(script|src)']
Affected Versions
- -----------------
4.0
3.6.1
3.6
3.5
3.4.2
3.4.1
and probably others
Solution
- --------
The attached patch was committed to the svn (revision r24666).
https://svn.torproject.org/svn/torstatus/
Thanks to Robert, Andrew, Olaf, Damian and Sebastian.
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762c762
< echo "<td class='TDS'>" . $record[$value] . "</td>";
---
> echo "<td class='TDS'>" . htmlentities($record[$value], ENT_QUOTES) . "</td>";
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